[phenixbb] does phenix.refine ignore F-obs, SIGF-obs?

Pavel Afonine PAfonine at lbl.gov
Thu Mar 11 13:21:46 PST 2010

Hi Scott,

> Can phenix.refine be directed to use F-obs <= 0?

No. See:


section "Remark on using amplitudes (Fobs) vs intensities (Iobs)".

> in particular can either of these flags be given slight negative 
> numbers?
> input.xray_data.sigma_fobs_rejection_criterion= -0.1
> input.xray_data.sigma_iobs_rejection_criterion= -0.1
> BTW what does this flag do?

It rejects reflections by sigma. In the past people used to cut the data at 2sigma or so. It is 0 by default in phenix.refine.


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